My 5 year old daughter is being taught French in school and she hardly remembers anything. Does it make sense to teach foreign language if the parent doesn't know the language?

It makes sense. But in later years,kids need to practice foreign language at home too.....thats not possible when parents do not know the language. Unless you spend extra on out of school tuitions. Though I am planning to take Mandarin classes (son of 4yrs has Mandarin) next year.